Chop up the potato. The smaller the pieces, the quicker the potato will cook.
Add the grapeseed oil to a large frying pan, add the potato into it, cover the pan, and sauté about 5 minutes over medium heat/flame.
Wash the leeks. Give them a good rinse. Then, slice them up and drop the slices into a large bowl of water with a splash of vinegar in it. Let this sit for about 10 minutes and then drain the water out (while you are waiting, you can peel and chop the onions, ginger, and garlic). Then fill the bowl up again and drain the water out again. Repeat this step a couple more times until the leeks are completely clean.
Peel and chop up the onion, ginger, and garlic.
Rinse the celery and chop up the celery stalks.
Add in the onions, ginger, garlic, and celery, and sauté for about 7–10 minutes over a medium flame/heat. Make sure to stir often so nothing burns.
Add in the leeks, jalapeño, frozen kale (no need to thaw it), coriander, smoked paprika, and turmeric, and stir well for another 3–5 minutes or until kale has thawed and leeks are tender.
Remove from heat and season with salt and pepper to taste.
This next step is completely optional, so, if you prefer, you can serve this dish garnished with some chopped fresh parsley.